For loop issues

[BigEasy]

What am I doing wrong here? From what I can tell, my for loop (for x in s1) is not actually looping through the characters. But I don't know how to fix it.

# Type your code here
  
def find_mismatch(s1,s2):
    count = 0
    s1 = s1.lower()
    s2 = s2.lower()
    s1 = list(s1)
    s2 = list(s2)
    #print(s1, s2)
    
    if len(s1) != len(s2):
        return 2
    
    elif s1 == s2:
        return 0
    else:
        for x in s1:
            for y in s2:
                if y != x:
                    count += 1
            #return count
            
            if count < 2:
                return 1
            else:
                return 2

Output:
Your function return is NOT CORRECT.
For example when your function is called as shown below:
find_mismatch('Hello There', 'helloothere')
Your function returns:
2
The correct return value is:
1