#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include <cstdio>
#include <vector>
#include <map>
#include <set>
#include <algorithm>
#include <string>
#include <cstdlib>
#include <stack>
#include <queue>
#include <cmath>

#define rep(i,j,k) for(int i=(int)j;i<(int)k;i++)
#define repp(i,j,k) for(int i=j;i>=k;i--)
#define llrep(i,j,k) for(long long int i=j;i<(long long int)k;i++)
#define Sort(x) sort(x.begin(),x.end()); 
#define vi vector<int>
#define vvi vector<vector<int>> 
#define ll long long
int mod=1e9+7;
const int INF = 100000000;

using namespace std;

void p(int x) {
	cout << x << endl;
}

void pp(string s) {
	cout << s << endl;
}




int main(void) {
	string ss;
	cin >> ss;
	//ss.c_str();
	rep(i, 0, ss.length()) {
		if (65 <= ss[i] && ss[i] <= 90)printf("%c", ss[i]+'a'-'A');
		else printf("%c", ss[i]+'A'-'a');
	}
	cout << endl;
	return 0;
}