#include <cstdio>
#include <cstring>
#include <iostream>

int main(){
    char S[110];
    scanf("%s", S);

    int L = strlen(S);
    for(int i=0;i<L;i++){
        if('a' <= S[i] && S[i] <= 'z'){
            putchar(std::toupper(S[i]));
        }else{
            putchar(std::tolower(S[i]));
        }
    }

    puts("");
}