# 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
# ------------------------------------------------------------
def decode_char(c)
table = {
'7' => 'T',
'1' => 'I',
'5' => 'S',
'3' => 'E',
'4' => 'A',
'0' => 'O'
}
table.fetch(c, c) # keep letters like H, M, G, etc.
end
# ------------------------------------------------------------
# Convert an entire string from leet speak to normal text
# ------------------------------------------------------------
def decode_leet_speak(s)
s.chars.map { |c| decode_char(c) }.join
end
# ------------------------------------------------------------
# Test lines provided by the user
# ------------------------------------------------------------
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
lines.each do |line|
puts decode_leet_speak(line)
end
=begin
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.
=end
