#include<iostream>
#include<algorithm>
using namespace std;
int main(){	 
	string s;
	getline(cin,s);
	for(int i=0;i<s.length();i++){
		if(islower(s[i]))
			cout<<char(toupper(s[i]));
		else if(isupper(s[i]))
			cout<<char(tolower(s[i]));
		else
			cout<<s[i];
	}
	return 0;
}