#include <bits/stdc++.h>
#include <cassert>
#define rep(i, n) for (int i = 0; i < (n); i++)
using namespace std;
using ll = long long;
using P = pair<int, int>;
/*
struct Edge
{
    int to;
    int weight;
    Edge(int t, int w) : to(t), weight(w) {}
};
using Graph = vector<vector<Edge>>;
*/
using Graph = vector<vector<int>>;

const long long INF = 1LL << 60;
const int INT_INF = 1000000000;

int dx[4] = {1, 0, -1, 0}, dy[4] = {0, 1, 0, -1};
// int dx[8] = {-1, -1, -1, 0, 0, 1, 1, 1}, dy[8] = {-1, 0, 1, 1, -1, 1, 0, -1};

const int mod = 1000000007;
struct mint
{
    ll x; // typedef long long ll;
    mint(ll x = 0) : x((x % mod + mod) % mod) {}
    mint operator-() const { return mint(-x); }
    mint &operator+=(const mint a)
    {
        if ((x += a.x) >= mod)
            x -= mod;
        return *this;
    }
    mint &operator-=(const mint a)
    {
        if ((x += mod - a.x) >= mod)
            x -= mod;
        return *this;
    }
    mint &operator*=(const mint a)
    {
        (x *= a.x) %= mod;
        return *this;
    }
    mint operator+(const mint a) const { return mint(*this) += a; }
    mint operator-(const mint a) const { return mint(*this) -= a; }
    mint operator*(const mint a) const { return mint(*this) *= a; }
    mint pow(ll t) const
    {
        if (!t)
            return 1;
        mint a = pow(t >> 1);
        a *= a;
        if (t & 1)
            a *= *this;
        return a;
    }

    // for prime mod
    mint inv() const { return pow(mod - 2); }
    mint &operator/=(const mint a) { return *this *= a.inv(); }
    mint operator/(const mint a) const { return mint(*this) /= a; }
};
istream &operator>>(istream &is, const mint &a) { return is >> a.x; }
ostream &operator<<(ostream &os, const mint &a) { return os << a.x; }

struct combination
{
    vector<mint> fact, ifact;
    combination(int n) : fact(n + 1), ifact(n + 1)
    {
        assert(n < mod);
        fact[0] = 1;
        for (int i = 1; i <= n; ++i)
            fact[i] = fact[i - 1] * i;
        ifact[n] = fact[n].inv();
        for (int i = n; i >= 1; --i)
            ifact[i - 1] = ifact[i] * i;
    }
    mint operator()(int n, int k)
    {
        if (k < 0 || k > n)
            return 0;
        return fact[n] * ifact[k] * ifact[n - k];
    }
    mint p(int n, int k)
    {
        return fact[n] * ifact[n - k];
    }
} c(1000005);

int main()
{
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    string S;
    cin >> S;
    int n = S.size();
    vector<vector<mint>> dp(n + 1, vector<mint>(4));
    dp[0][0] = 1;
    for (int i = 0; i < n; i++) {
        if (S[i] == 'A' || S[i] == '?') {
            for (int j = 0; j < 4; j++) {
                dp[i + 1][j] += dp[i][j];
            }
            dp[i + 1][1] += dp[i][0];
        }
        if (S[i] == 'B' || S[i] == '?')
        {
            for (int j = 0; j < 4; j++)
            {
                dp[i + 1][j] += dp[i][j];
            }
            dp[i + 1][2] += dp[i][1];
        }
        if (S[i] == 'C' || S[i] == '?')
        {
            for (int j = 0; j < 4; j++)
            {
                dp[i + 1][j] += dp[i][j];
            }
            dp[i + 1][3] += dp[i][2];
        }
    }
    cout << dp[n][3] << endl;
    return 0;
}


Measured memory_bytes: 25668