真不错

#include<bits/stdc++.h>
#include <iostream>
using namespace std;
int main(){
char a[10005];
gets(a);
int len=strlen(a);
for(int i=0;i<len;i++){
if(a[i]>='a' && a[i]<='y' || a[i]>='A' && a[i]<='Z'){
a[i]=a[i]+1;
}else if(a[i]>='z' && a[i]<='z' || a[i]>='Z' && a[i]<='Z'){
a[i]=a[i]-25;
}
}
cout<<a;
return 0;
}