题解

#include <bits/stdc++.h>
using namespace std;
int main(){
string s,s1="";
getline(cin,s);
for(int i=0;i<s.size();i++)
{
if(s[i]>='A'&&s[i]<='Z')
{
if(s[i]>='F') s1+=char(s[i]-5);
else s1+=char(s[i]+21);
}
else
s1+=s[i];
}
cout<<s1<<endl;
return 0;
}