import Foundation
// 7H15 M3554G3 is written in leet speak, where numbers resemble letters.
// place each leetspeak character with its matching letter
// (7 -> T, 1 -> I, 5 -> S, 3 -> E) and build a new string
// 7H15 -> THIS | M3554G3 -> MESSAGE
//
// Your brain can interpret distorted or number‑substituted letters
// surprisingly well because it recognizes the overall word
// shapes and patterns, not just individual characters.
// ------------------------------------------------------------
// Convert a single leet character into a normal alphabet letter
// ------------------------------------------------------------
func decodeChar(_ c: Character) -> Character {
switch c {
case "7": return "T"
case "1": return "I"
case "5": return "S"
case "3": return "E"
case "4": return "A"
case "0": return "O"
default: return c // keep letters like H, M, G, etc.
}
}
// ------------------------------------------------------------
// Convert an entire string from leet speak to normal text
// ------------------------------------------------------------
func decodeLeetSpeak(_ s: String) -> String {
return String(s.map(decodeChar))
}
// ------------------------------------------------------------
// Test lines provided by the user
// ------------------------------------------------------------
let lines = [
"7H15 M3554G3",
"53RV35 7O PR0V3",
"H0W 0UR M1ND5 C4N",
"D0 4M4Z1NG 7H1NG5!",
"1MPR3551V3 7H1NG5!",
"1N 7H3 B3G1NN1NG",
"17 WA5 H4RD BU7",
"N0W, Y0UR M1ND 1S",
"R34D1NG 17",
"4U70M471C4LLY."
]
// Decode and print each line
for line in lines {
print(decodeLeetSpeak(line))
}
/*
run:
THIS MESSAGE
SERVES TO PROVE
HOW OUR MINDS CAN
DO AMAZING THINGS!
IMPRESSIVE THINGS!
IN THE BEGINNING
IT WAS HARD BUT
NOW, YOUR MIND IS
READING IT
AUTOMATICALLY.
*/
