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

const int N = 2e5+10;

int q,c[N],o[N],w[N];

char s[N];

int main(){
	freopen("operation.in","r",stdin);
	freopen("operation.out","w",stdout);
	cin>>(s+1);
	scanf("%d",&q);
	int n=strlen(s+1);
	for(int i=1;i<=n;i++){
		c[i]=c[i-1]+(s[i]=='C');
		o[i]=o[i-1]+(s[i]=='O');
		w[i]=w[i-1]+(s[i]=='W');
	}
	while(q--){
		int l,r;
		scanf("%d%d",&l,&r);
		int cc=c[r]-c[l-1];
		int oo=o[r]-o[l-1];
		int ww=w[r]-w[l-1];
		if((oo%2)!=(ww%2)){
			printf("N");
		}else{
			cc+=min(oo,ww);
			if(cc%2){
				printf("Y");
			}else printf("N");
		}
	}
	return 0;
}