Write a python program to display all the common characters between two strings. Return -1 if there are no matching characters.

CommonCharacter.py

# Write a python program to display all the common characters between two strings. Return -1 if there are no matching characters.

def find_common_characters(msg1,msg2):
    result = []
    if len(msg1) > len(msg2):
        
        result = my_func(msg1,msg2)
    else:
        
        result = my_func(msg2,msg1)
    
    if len(result) == 0:
        return -1
    
    else:
        
        result = "".join(result)
        
        return result.replace(" ","")


def my_func(bigger,smaller):
    length = len(smaller)
    bigger =list(bigger)
    smaller = list(smaller)
    
    i = 0
    result = []
    while i < length :
        ans = smaller[i] in bigger
        if ans == True:
            result.append(smaller[i])
            bigger.remove(smaller[i])
        i = i + 1
    return result

msg1="abababasdsd"
msg2="asdscsdw"
common_characters=find_common_characters(msg1,msg2)
print(common_characters)