#include <iostream>
#include <fstream>
using namespace std;

char S[200];

void input(istream& in)
{
	in >> S;
}

char *resolve()
{
	char *p = S;
	while (*p) {
		*p ^= 0x20;
		p++;
	}
	return S;
}

int main()
{
	input(cin);
	cout << resolve() << endl;
	return 0;
}