def main():
    N = input()
    N_with_comma = ""
    for idx, num in enumerate(N):

        N_with_comma += num
        if idx == len(N)-1:
            continue
        if (len(N) - idx) % 3 == 1:
            N_with_comma += ","

    print(N_with_comma)


if __name__ == "__main__":
    main()