I'm new to codeforce. If there is any format error or anything wrong with this post please tell me, thank you.

This is the result of Codeforces Round #604 (Div. 2) Problem A. I think I just print the correct output, but I fail the pretest. Error message of my result:

example output:

Can anybody explain to me?Thank you so much... (If you need the code please tell me.)