#include <bits/stdc++.h>
using namespace std;
int main()
{
	string s;
	cin>>s;
	for(int i=0;i<=s.size();i++)
	{
		if(i==0&&s[i]>='a'&&s[i]<='z')
		{
			s[i]-=32;
		}
		else
		if(i>0&&s[i]>='A'&&s[i]<='Z')
		{
			s[i]+=32;
		}
		cout<<s[i];
	}
	return 0;
}