#include <iostream>
#include <string>
using namespace std;

int main() {
    string S;
    cin >> S;
    int N = S.size();
    int count = 0;

    // すべての長さ5のインデックスの組み合わせを試す
    for (int i = 0; i < N; ++i)
    for (int j = i + 1; j < N; ++j)
    for (int k = j + 1; k < N; ++k)
    for (int l = k + 1; l < N; ++l)
    for (int m = l + 1; m < N; ++m) {
        char c1 = S[i];
        char c2 = S[j];
        char c3 = S[k];
        char c4 = S[l];
        char c5 = S[m];

        // 条件チェック
        if (c1 == c3 &&
            c2 != c1 && c4 != c1 && c5 != c1 &&
            c2 != c4 && c2 != c5 && c4 != c5) {
            ++count;
        }
    }

    cout << count << endl;
    return 0;
}