1

SPACE = '\\'
STRAR = ':'
a = 3
if __name__ == "__main__":
    rows = 5
    spaces = rows-1
    stars = 1


    for i in range(rows):
        print(
            (SPACE*spaces) +
            (STRAR*stars) +
            (SPACE*spaces)
        )
        stars += 4
        spaces -= 1