Initials

Problem

Write a function that takes a first name and a last name (each one with at least one letter) and returns their initials in capitals, each one with its period: with "alan" and "turing" it returns "A. T.".

Examples

• "Grace", "Hopper" → "G. H."

• "alan", "turing" → "A. T."

• "Ada", "Lovelace" → "A. L."

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

You start with this

def initials(first, last):
    pass

function initials(first, last) {
}