#include<iostream>
#include<cmath>
#include<string>
#include<algorithm>
using namespace std;
int main(){
    string s;
    cin >> s;
    for(int i=0;i<s.length();i++){
        if(s[i]>'`')s[i]-=32;
        else s[i]+=32;
    }
    cout << s << endl;
}