#include <bits/stdc++.h>
using namespace std;


int main(){
string s;
cin>>s;
for (int i = 0; i < s.length(); ++i) {
    if(s[i]>=97&&s[i]<=122){
      s[i]=s[i]-32;
      cout<<s[i];
    }else{
      s[i]=s[i]+32;
    cout<<s[i];
    }
}
cout<<endl;
	return 0;
}