print_int(12, 7) # "0000012"
print_int(12, 6) # "000012"
print_int(12, 5) # "00012"
print_int(12, 4) # "0012"
print_int(12, 3) # "012"
print_int(12, 1) # "12"
print_int(12, 2) # "12"
print_int(123456, 7) # "0123456"
print_int(123456789, 7) # "123456789"
print_int(-12, 4) # "-012"
print_int(-12, 3) # "-12"
print_int(-12, 2) # "-12"
print_int(-12, 1) # "-12"
print_int(-1234, 6) # "-01234"
print_int(-1234, 5) # "-1234"
print_int(-1234, 4) # "-1234"
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