from functools import lru_cache


@lru_cache
def enumerate_all_pattern(string: str) -> set[str]:
    if len(string) == 1:
        return set(string)

    patterns = set()
    head_patterns = {
        string[0] + pattern for pattern in enumerate_all_pattern(string[1:])}
    tail_patterns = {
        string[-1] + pattern for pattern in enumerate_all_pattern(string[:-1])}
    return head_patterns | tail_patterns


def main():
    S = input()

    patterns = enumerate_all_pattern(S)
    print(len(patterns))


if __name__ == "__main__":
    main()