#include<iostream> // cin\cout\endl #include<cstdio> //scanf()\printf() #include<cstring> // strcpy()\strcat()\strcmp()\strlen()\memset() #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() using namespace std; int main(){ char n,b; cin>>n; if(n<=90 && n>=65){ b=n+32; cout<<b; } else{ b=n-32; cout<<b; } return 0; }