check string is transformable or not

cst.py

# check string is transformable or not

def detect_digit(s):
    for c in range(len(s)):
        if s[c] not in ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9']:
            return False
        else:
            return True

s = input("first string ::: ")
t = input("second string ::: ")

assert 1 <= len(s) <= 105, "too long"
assert len(s) == len(t), "length must be equal"
assert len(s) != 1 or len(t) != 1, "can't transform"
assert detect_digit(s) or detect_digit(t), "chars must be digit"

def is_transformable(s):
    list_string, list_t, sorted_s_lst = list(s), list(t), list(s)
    for i in range(2, len(list_string), 2): # start from 2 beacuse of the upper bound of slicing string 
        cutted_string = sorted_s_lst[:i] # i doesn't count
        sorted_cutted_string = [str(n) for n in sorted(list(filter(lambda n: int(n), cutted_string)))]
        sorted_s_lst = sorted_cutted_string+sorted_s_lst[i:]
    unequal_indices = [sorted_s_lst.index(i) for i, j in zip(sorted_s_lst, list_t) if i!=j]
    if sorted_s_lst == list_string:
        return False
    else:
        greater_val = sorted_s_lst[unequal_indices[0]]
        smaller_val = sorted_s_lst[unequal_indices[1]]
        sorted_s_lst[unequal_indices[1]] = greater_val
        sorted_s_lst[unequal_indices[0]] = smaller_val
        sorted_s = "".join(sorted_s_lst)
        if sorted_s == t:
            return True


if is_transformable(s):
    print("|>> is transformable <<|")
else:
    print("|>> is NOT transformable <<|")