#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;
typedef long long ll;
ll M=1000000007;

int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */ 
    string s;
    ll l,r,t;
    int A[26]={0};
    bool f[26]={false};
    cin >> s;
    for(int i=0;i<26;i++)
        A[s[i]-97]++;
    cin >> t;
    while(t--)
    {
        cin >> l >> r;
        for(int i=0;i<26;i++)
            f[i]=false;
        ll c=0;
        for(int i=l;i<=r;i++)
        {
            if(f[s[i]-97]==false)
            {
                if(A[s[i]-97]%2==1)
                {
                    c++;
                }
                f[s[i]-97]=true;
            }
        }
        cout << c << endl;
    }
    return 0;
}