#ZAGNIEŻDŻENIA

for a in range(5):
    print(f"a: {a}")
    for b in range(20,40,2):
        print(f"      b: {b}")

#TABLICZKA MNOZENIA

for a in range(1,11):
    line = ""
    for b in range(1,11):
        line += str(a*b).center(4) + "|"
    print(line)

    line2 = ""
    for c in range(1,50):
        line2 += "-"
    print(line2)