Add uppercase letters
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@@ -3,7 +3,7 @@
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std::string reverse_letter(const std::string &str)
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std::string reverse_letter(const std::string &str)
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{
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{
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std::string alphabet ("abcdefghijklmnopqrstuvwxyz");
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std::string alphabet ("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ");
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std::string result ("");
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std::string result ("");
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for (int i = str.length() - 1; i >= 0; i--){
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for (int i = str.length() - 1; i >= 0; i--){
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if (alphabet.find(str[i]) != std::string::npos){
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if (alphabet.find(str[i]) != std::string::npos){
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