Problem:
Score : 400 points

Problem Statement

The ABC number of a string T is the number of triples of integers (i, j, k) that satisfy all of the following conditions:

1 ≤ i < j < k ≤ |T| (|T| is the length of T.)

T_i = A (T_i is the i-th character of T from the beginning.)

T_j = B

T_k = C

For example, when T = ABCBC, there are three triples of integers (i, j, k) that satisfy the conditions: (1, 2, 3), (1, 2, 5), (1, 4, 5). Thus, the ABC number of T is 3.

You are given a string S. Each character of S is A, B, C or ?.

Let Q be the number of occurrences of ? in S. We can make 3^Q strings by replacing each occurrence of ? in S with A, B or C. Find the sum of the ABC numbers of all these strings.

This sum can be extremely large, so print the sum modulo 10^9 + 7.

Constraints

3 ≤ |S| ≤ 10^5

Each character of S is A, B, C or ?.

Input

Input is given from Standard Input in the following format:

S

Output

Print the sum of the ABC numbers of all the 3^Q strings, modulo 10^9 + 7.

Sample Input 1

A??C

Sample Output 1

8

In this case, Q = 2, and we can make 3^Q = 9 strings by by replacing each occurrence of ? with A, B or C. The ABC number of each of these strings is as follows:

AAAC: 0

AABC: 2

AACC: 0

ABAC: 1

ABBC: 2

ABCC: 2

ACAC: 0

ACBC: 1

ACCC: 0

The sum of these is 0 + 2 + 0 + 1 + 2 + 2 + 0 + 1 + 0 = 8, so we print 8 modulo 10^9 + 7, that is, 8.

Sample Input 2

ABCBC

Sample Output 2

3

When Q = 0, we print the ABC number of S itself, modulo 10^9 + 7. This string is the same as the one given as an example in the problem statement, and its ABC number is 3.

Sample Input 3

????C?????B??????A???????

Sample Output 3

979596887

In this case, the sum of the ABC numbers of all the 3^Q strings is 2291979612924, and we should print this number modulo 10^9 + 7, that is, 979596887.

Solution in C++14 (GCC 5.4.1) (judge verdict: Accepted)

#include <bits/stdc++.h>
using namespace std;
const int mod = 1000000007;
char st[100005];
long long s0[100005],s1[100005], s2[100005], s3[100005];
int main(){
	scanf("%s",st + 1);
	int n = strlen(st + 1);
	s1[0] = s2[0] = s3[0] = 0;
	s0[0] = 1;
	for (int i = 1; i <= n; i++)
		if (st[i] == '?')
			s0[i] = s0[i - 1] * 3 % mod;
		else
			s0[i] = s0[i - 1];
	for (int i = 1; i <= n; i++)	
		if (st[i] == '?'){
			s1[i] = (s1[i - 1] * 3 + s0[i - 1]) % mod;
		} else {
			s1[i] = (s1[i - 1] + (st[i] == 'A') * s0[i - 1]) % mod;
		}
	for (int i = 1; i <= n; i++)	
		if (st[i] == '?'){
			s2[i] = (s2[i - 1] * 3 + s1[i - 1]) % mod;
		} else {
			s2[i] = (s2[i - 1] + (st[i] == 'B') * s1[i - 1]) % mod;
		}
	for (int i = 1; i <= n; i++)	
		if (st[i] == '?'){
			s3[i] = (s3[i - 1] * 3 + s2[i - 1]) % mod;
		} else {
			s3[i] = (s3[i - 1] + (st[i] == 'C') * s2[i - 1]) % mod;
		}
	printf("%d\n",(int)s3[n]);
}