#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 b,a; cin>>a; if(65<=a&&90>=a) { b=a+32; } if(97<=a&&122>=a) { b=a-32; } cout<<b; return 0; }