2018-12-14acm白银第二题

#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);

}

}