放透视-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
#include <iostream>
using namespace std;
int main(){
string a;
cin >> a;
for(int i=0;i<a.size();i++){
if(a[i]>='A' && a[i]<='Z'){
a[i]+=32;
}else if(a[i] >= 'a' && a[i] <='z'){
a[i]-=32;
}
}
cout << a;
return 0;
}
