Reverse Only Letters - Solution

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SOLUTION

string reverseOnlyLetters(string s){

int i = 0, j = s.size()-1;

for (int i = 0; i < j; )

{

bool a = isalpha(s[i]);

bool b = isalpha(s[j]);

if(a && b){

swap(s[i],s[j]);

i++;

j--;

}else if(!a){

i++;

}else if(!b){

j--;

}

}

return s;

}