#include <algorithm>
#include <iostream>
#include <fstream>
#include <cstdio>
#include <string>
#include <vector>
#include <stack>
#include <queue>
#include <cmath>
#include <functional>
#include <cassert>
#include <iomanip>
#include <array>
#include <time.h>
#include <limits.h>
#include <numeric>
#define debug(x) cout<<#x<<": "<<x<<endl
#define rep(i,n) for (int i=0;i<(n);i++)
#define FOR(i,a,b) for (int i=(a);i<=(b);i++)
using namespace std;

typedef vector<int> vi;

template <typename T_char>
T_char ToUpper(T_char cX) { return toupper(cX); }
template <typename T_char>
T_char ToLower(T_char cX) { return tolower(cX); }

void solve(){
#ifdef _WIN32
	istream &cin = ifstream("input.txt");
#endif
	string str, ustr, lstr;
	cin >> str;
	ustr.resize(str.size());
	lstr.resize(str.size());
	transform(str.begin(), str.end(), ustr.begin(), ToUpper<char>);
	transform(str.begin(), str.end(), lstr.begin(), ToLower<char>);
	rep(i, str.size()){
		if (str[i] == ustr[i]) cout << lstr[i];
		else cout << ustr[i];
	}

	cout << endl;
}

int main(){
	cin.tie(0);
	ios::sync_with_stdio(false);

	solve();
	system("PAUSE");
	return 0;
}