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< p > Given a string < code > s< / code > consisting of lowercase English letters. Perform the following operation:< / p >
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< ul >
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< li > Select any non-empty < span data-keyword = "substring-nonempty" > substring< / span > then replace every letter of the substring with the preceding letter of the English alphabet. For example, ' b' is converted to ' a' , and ' a' is converted to ' z' .< / li >
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< / ul >
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< p > Return the < span data-keyword = "lexicographically-smaller-string" > < strong > lexicographically smallest< / strong > < / span > string < strong > after performing the operation< / strong > .< / p >
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< p > < / p >
< p > < strong class = "example" > Example 1:< / strong > < / p >
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< div class = "example-block" >
< p > < strong > Input:< / strong > < span class = "example-io" > s = " cbabc" < / span > < / p >
< p > < strong > Output:< / strong > < span class = "example-io" > " baabc" < / span > < / p >
< p > < strong > Explanation:< / strong > < / p >
< p > Perform the operation on the substring starting at index 0, and ending at index 1 inclusive.< / p >
< / div >
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< p > < strong class = "example" > Example 2:< / strong > < / p >
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< div class = "example-block" >
< p > < strong > Input:< / strong > < span class = "example-io" > s = " aa" < / span > < / p >
< p > < strong > Output:< / strong > < span class = "example-io" > " az" < / span > < / p >
< p > < strong > Explanation:< / strong > < / p >
< p > Perform the operation on the last letter.< / p >
< / div >
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< p > < strong class = "example" > Example 3:< / strong > < / p >
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< div class = "example-block" >
< p > < strong > Input:< / strong > < span class = "example-io" > s = " acbbc" < / span > < / p >
< p > < strong > Output:< / strong > < span class = "example-io" > " abaab" < / span > < / p >
< p > < strong > Explanation:< / strong > < / p >
< p > Perform the operation on the substring starting at index 1, and ending at index 4 inclusive.< / p >
< / div >
< p > < strong class = "example" > Example 4:< / strong > < / p >
< div class = "example-block" >
< p > < strong > Input:< / strong > < span class = "example-io" > s = " leetcode" < / span > < / p >
< p > < strong > Output:< / strong > < span class = "example-io" > " kddsbncd" < / span > < / p >
< p > < strong > Explanation:< / strong > < / p >
< p > Perform the operation on the entire string.< / p >
< / div >
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< p > < / p >
< p > < strong > Constraints:< / strong > < / p >
< ul >
< li > < code > 1 < = s.length < = 3 * 10< sup > 5< / sup > < / code > < / li >
< li > < code > s< / code > consists of lowercase English letters< / li >
< / ul >
