a

p = 'ababcabccabc'
ABC='ABC'
def fix_string(s):
    s=s.upper()
    sequence_length=len(s)
    while True:
        found = False
        for i in range(len(s) - sequence_length + 1):
            if ABC in s:
                s=s.replace("ABC", "")
                found= True
                break      
        if not found:
            if len(s) == 0:
                return '-1'
            else:
                break
    return s

print(fix_string(p))

    


# def remove_sequence_from_string(input_string, sequence):
#     sequence_length = len(sequence)
#     while True:
#         found = False
#         for i in range(len(input_string) - sequence_length + 1):
#             if input_string[i:i + sequence_length] == sequence:
#                 input_string = input_string[:i] + input_string[i + sequence_length:]
#                 found = True
#                 break
        
#         if not found:
#             if len(input_string) == 0:
#                 return-1
#             else:
#                 break

#     return input_string


# # Example usage:
# input_str = 'ababcabccabc'
# sequence_to_remove = "abc"

# result = remove_sequence_from_string(input_str, sequence_to_remove)
# print(result)