#include <bits/stdc++.h>
using namespace std;
const int N=2e5+10;
int n,o[N],w[N],c[N];
string a;
int main(){
	freopen("operation.in","r",stdin);
	freopen("operation.out","w",stdout);
	cin>>a>>n;
	for(int i=0;i<a.size();i++){
		if(a[i]=='O') o[i+1]++;
		if(a[i]=='W') w[i+1]++;
		if(a[i]=='C') c[i+1]++;
		c[i+1]+=c[i];
		o[i+1]+=o[i];
		w[i+1]+=w[i];
	}
	int x,y;
	for(int i=1;i<=n;i++){
		cin>>x>>y;
		x--;
		if((o[y]-o[x])%2==(w[y]-w[x])%2&&(o[y]-o[x])%2!=(c[y]-c[x])%2) cout<<"Y";
		else cout<<"N";
	}
	return 0;
}