#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    char ch[10000];
    cin>>ch;
    int t;
    cin>>t;
    while(t--)
    {
        int l,r;
        cin>>l>>r;
        l=l-1;
        r=r-1;
        int tot=0;
        int a[26]={0};
        for(int i=l;i<=r;i++)
        {
            a[ch[l]-97]++;
        }
        for(int i=0;i<26;i++)
            tot+=a[i]/2;
        cout<<tot<<endl;
    }
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    return 0;
}