Задача 2

s = input()
n, t = map(int, input().split())

draw = [["_" for _ in range(n)] for _ in range(n)]

start_line = int((n - t) / 2)
for i in range(start_line, start_line + t):
    draw[i] = ["*" for _ in range(n)]

if s == "+":
    for i in range(n):
        line = draw[i]
        for k in range(start_line, start_line + t):
            line[k] = "*"
        draw[i] = line

for line in draw:
    print("".join(line))