fout = open("triangles.txt", "w")

# Triangle 1.
for y in range(0, 5):
    for x in range(0, y + 1):
        fout.write("*")
    fout.write("\n")
fout.write("\n")

# Triangle 2.          
for y in range(0, 5):
    for x in range(0, 5 - y):
        fout.write("*")
    fout.write("\n")
fout.write("\n")

# Triangle 3.
for y in range(0, 5):
    for x in range(0, 4 - y):
        fout.write(" ")
    for x in range(0, y + 1):
        fout.write("*")
    fout.write("\n")
fout.write("\n")