#include <bits/stdc++.h>
using namespace std;
string s;
int main(){
	cin>>s;
	if(isupper(s[0])){
		cout<<s<<endl;
	}else if(islower(s[s.size()-1])){
		cout<<s<<endl;
	}else{
		s[0]=toupper(s[0]);
		s[s.size()-1]=tolower(s[s.size()-1]);
		cout<<s<<endl;
	}
	return 0;
}