def main():
    S = input()
    S_reverse = S[::-1]
    ing_count = [0]

    for idx, letter in enumerate(S_reverse):
        if S_reverse[idx:].startswith("gni"):
            ing_count[-1] += 1
        if letter == "S":
            ing_count.append(0)

    ing_count = ing_count[:-1]
    if not ing_count:
        print(0)
        return

    ing_count_partial_sum = []
    for count_ in ing_count:
        if not ing_count_partial_sum:
            ing_count_partial_sum.append(count_)
        else:
            ing_count_partial_sum.append(ing_count_partial_sum[-1]+count_)
    print(sum(ing_count_partial_sum))


if __name__ == "__main__":
    main()