I have written the following code to complete this question:

def swap_values(user_val1, user_val2):

return (user_val2, user_val1)

if __name__ == '__main__':

x = int(input())

y = int(input())

x, y = y, x

print(x, y)

For some reason, it passes the first test but when it runs tests 2, 3, and 4 it fails with no error.

Why does this work for the first input but not the rest?