def main():
try:
a = float(input())
b = float(input())
except ValueError:
print("błędna wartość")
return
if a <= 0 or b <= 0:
print("błędna wartość")
else:
pole = a * b
obwod = 2 * (a + b)
print(f"Pole prostokąta: {pole}")
print(f"Obwód prostokąta: {obwod}")
if __name__ == "__main__":
main()
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