#include<bits/stdc++.h>
using namespace std;
int main(){
    char s[85];
    cin>>s;
    for(int i=0;i<strlen(s);i++){
        if(s[i]>='a'&&s[i]<='z'){
            cout<<char(s[i]-32);
        }
        else if(s[i]>='A'&&s[i]<='Z'){
            cout<<char(s[i]+32);
        }
        else cout<<s[i];
    }
    return 0;
}
/**************************************************************
	Problem: 1182
	User: luyanchen
	Language: C++
	Result: Accepted
	Time:10 ms
	Memory:2072 kb
****************************************************************/