The username

Problem

When you sign up you type your name and the app hands you a number. The username is the name in lowercase, an underscore and the number: with "Ann" and 7 you return "ann_7".

The name arrives with no extra spaces and has at least one letter; the number can be 0.

Examples

• "Ann", 7 → "ann_7"

• "PETER", 21 → "peter_21"

• "lucy", 3 → "lucy_3"

Besides these, the challenge has hidden tests that are revealed when you submit your solution.

You start with this

def username(name, num):
    pass

function username(name, num) {
}