题解

#include <bits/stdc++.h>
using namespace std;
int main(){
string s,s1="";
cin>>s;
for(int i=0;i<s.size();i++)
{
if(s[i]>='a'&&s[i]<='z')
{
int a=(int)s[i]-97;
a+=3,a%=26;
s[i]=(char)a+97;
}
else
{
int a=(int)s[i]-65;
a+=3,a%=26;
s[i]=(char)a+65;
}
}
for(int i=s.size()-1;i>=0;i--)
s1+=s[i];
for(int i=0;i<s1.size();i++)
{
if(s1[i]>='a'&&s1[i]<='z') s1[i]-=32;
else s1[i]+=32;
}
cout<<s1<<endl;
return 0;
}