字符串

#include <iostream>
#include <string>

using namespace std;

int main()
{
   string s,a;
   cin>>s;
   for(int i = 0;i<s.length();i++){
    if(s[i] == 'z') a[i] = 'a';
    else if(s[i] == 'Z') a[i] = 'A';
    else if(((int)s[i]>=65 && (int)s[i]<=89)||((int)s[i]>=97 && (int)s[i]<=121)) a[i] = s[i]+1;
    else  a[i] = s[i];
   }
   for(int i = 0;i<s.length();i++){
    cout<<a[i];
   }
    return 0;
}