#include<iostream>
using namespace std;
int main()
{
char a[1000000];
cin >> a;
for (int i = 1; a[i] != 0; i++)
{
if (a[i] >= 97)
{
for (int i = 0; a[i] != 0; i++)
{
cout << char(a[i]);
}
return 0;
}
}
for (int i = 0; a[i] != 0; i++)
{
if (a[i] >= 97)
cout << char(a[i] - 32);
else
cout <<char( a[i] + 32);
}
}
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