def main():
    MOD = 998244353

    N, X = map(int, input().split())
    R, B = 0, 0
    rbrb, brbr = [1] + [0] * 4, [1] + [0] * 4
    for i in range(X):
        c, v = input().split()
        v = int(v)
        if c == 'R':
            R += v
            rbrb[1] = (rbrb[1] + rbrb[0] * v) % MOD
            rbrb[3] = (rbrb[3] + rbrb[2] * v) % MOD
            brbr[2] = (brbr[2] + brbr[1] * v) % MOD
            brbr[4] = (brbr[4] + brbr[3] * v) % MOD
        else:
            B += v
            brbr[1] = (brbr[1] + brbr[0] * v) % MOD
            brbr[3] = (brbr[3] + brbr[2] * v) % MOD
            rbrb[2] = (rbrb[2] + rbrb[1] * v) % MOD
            rbrb[4] = (rbrb[4] + rbrb[3] * v) % MOD

    ans = 0
    ans += rbrb[-1] * pow(R-1, -1, MOD) * pow(B-1, -1, MOD) % MOD
    ans += brbr[-1] * pow(R-1, -1, MOD) * pow(B-1, -1, MOD) % MOD
    ans += R * (R-2) * pow(24, -1, MOD) % MOD
    ans += B * (B-2) * pow(24, -1, MOD) % MOD

    print(ans % MOD)


if __name__ == '__main__':
    main()