What's wrong with my code?

Question

A number is fed to the input. You need to count it and output this number squared.
Sample Input: 6
Sample Output: 36

puts "6"
num = gets.chomp.to_i
puts "6**2"

Answer 1

# Good Luck

num = gets.chomp.to_i
puts num**2

Answer 2

Thanks

Answer 3

String denoted by " "