#include <bits/stdc++.h>
using namespace std;
#define REP(i,N) for(i=0;i<N;i++)
typedef long long ll;
typedef pair<int, int> P;
typedef struct{
  int first;
  int second;
  int third;
}T;

//昇順
bool comp_Se(T& l, T& r){
  return l.second < r.second;
}

char change(char c){
  if(c-'a' >= 0) return c - 32;
  else return c + 32;
}

int main(void){
  string S;
  int i;
  cin >> S;
  REP(i,S.length()) cout << change(S[i]);
  cout << endl;
  return 0;
}