Help me in solving UNIQUEDECODE problem

help
,
1

My issue

Solution Failed on following Input
1
a
Your Output
0
Expected Output
1

My code

#include<bits/stdc++.h>
using namespace std;

typedef long long ll;
#define int ll
#define now(x) cout<<#x<<" : "<<x<<'\n';
#define fv(v) cout<<#v<<" : "; for(auto it:v) cout<<it<<" "; cout<<'\n';
#define pm(m) cout<<#m<<" : "; for(auto it:m) cout<<it.first<<" "<<it.second<<'\n';

const int modd = 1000000007;

void solve()
{
    string w; cin >> w;
    int m = w.length();
    int pq_p = 0, pq_q = 0, p_p = 0;
    
    for(int i = 0; i < m;++i)
    {
        if(w[i] == 'p') {
            pq_p = (pq_q + pq_p) % modd;
            
            p_p = (2 * p_p) % modd;
            p_p = (p_p + 1) % modd;
        }
        else{
            pq_q = (pq_q + p_p + pq_p) % modd;
        }
    }
    cout << (p_p + pq_q) % modd << '\n';
}

int32_t main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    
    int vk = 1;
    cin >> vk;
    while (vk--) {
        solve();
    }
}

Problem Link: Is it uniquely decodable Practice Coding Problem - CodeChef