why one of my inputs is empty?

[Huseyn201]

my input: 3 gr sud abc

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

int main() {
    ios_base::sync_with_stdio(0);
    int n;
    cin>>n;
    string a[1000];
    string s,b;
    for(int i=0;i<n;i++)
    {
        getline(cin,b);
        a[i]=b;
    }
}