def hammingDist(s1, s2):
    bytesS1=bytes(s1, encoding="ascii")
    bytesS2=bytes(s2, encoding="ascii")
    diff=0;
    for i in range(min(len(bytesS1),len(bytesS2))):
        if(bytesS1[i]^bytesS2[i]!=0):
            diff+=1;
    return(diff)