炒鸡easy!

#include<bits/stdc++.h>
using namespace std;
char a;
int main(){
cin >> a;
if(a >= 'a' && a <= 'z'){
a = a - 32;
cout << a;
}else if(a >= 'A' && a <= 'Z'){
a = a + 32;
cout << a;
}else{
cout << a;
}
return 0;
}