# L06 E07

# Program 0:
print("0:")
if (a < 0) == True:
    print(0)
else:
    if a >= 0:
        print(a)
        
print("1:")
# Program 1:
if a < 0:
    print(0)
else:
    print(a)

print("2:")
# Program 2:
if (a < 0) == True:
    print(0)
print(a)

print("3:")
# Program 3:
if (a > 0) == True:
    print(a)
else:
    print(0)

print("4:")
# Program 4:
if (a < 0) == True:
    print(0)
if a >= 0:
    print(a)