其它的太麻烦了

防透视防透视防透视防透视防透视防透视防透视防透视防透视防透视防透视防透视防透视防透视防透视防透视防透视防透视防透视防透视防透视防透视防透视防透视防透视防透视防透视防透视防透视防透视防透视防透视防透视防透视防透视防透视

#include<bits/stdc++.h>
using namespace std;
int main(){
    char c;
    cin>>c;
    if(isupper(c)) cout<<char(c+32);
    else cout<<char(c-32);
    return 0;
}