while True:
try:
a=int(raw_input("Wprowadz pierwsza liczbe calkowita: "))
b=int(raw_input("Wprowadz druga liczbe calkowita: "))
for i in range(a,b):
if i % 3 == 0 and i%7!=0:
print ("Liczba jest podzielna przez 3,nie jest podzielna przez 7", i)
break
except ValueError:
print "Prosze o wprowadzenie liczby calkowitej"
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