def test_four():
assert python2.four("String", "Fridge") == "SFtrriidngge"
assert python2.four("Dog", "Cat") == "DCoagt"
assert python2.four("True", "Tree") == "TTrrueee"
assert python2.four("return", "letter") == "rleettutrenr"
assert python2.four("Cat", "Dog") == "CDaotg"
def test_four():
assert python2.four("55 72 86") == 14
assert python2.four("15 72 80 164") == 11
assert python2.four("555 72 86 45 10") == 15
assert python2.four("98 63 34 1 13") == 17
assert python2.four("98 107 415") == 17