def tel_verschillen(woord_1, woord_2):
    verschillen = 0
    for i in range(len(woord_1)):
        if woord_1[i] != woord_2[i]:
            verschillen += 1
    return verschillen
    

print(tel_verschillen("hopen", "kopen")) # 1
print(tel_verschillen("hopen", "hopen")) # 0
print(tel_verschillen("horen", "kapel")) # 4
print(tel_verschillen("horen", "aapje")) # 5