#include<cstdio>
#include<cmath>
#include<iostream>
#include<algorithm>
#include<queue>
using namespace std;
int main(){
    string str;
    cin >> str;
    for(int i=0;i<str.size();i++){
        if(95<=str[i])
            str[i]-=32;
        else
            str[i]+=32;
    }
    cout << str << endl;
    return 0;
}