PAT 乙级 1040

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# author: a2htray
# create date: 2023/3/25

"""
PAT 乙级 1039
"""

if __name__ == '__main__':
    line = input()

    num_t = 0
    num_at = 0
    num_pat = 0

    for i in range(len(line) - 1, -1, -1):
        if line[i] == 'T':
            num_t += 1
        if num_t != 0 and line[i] == 'A':
            num_at += num_t
        if num_at != 0 and line[i] == 'P':
            num_pat += num_at

    print(num_pat % 1000000007)