/* ***********************************************
Author        :kuangbin
Created Time  :2016/4/22 19:01:07
File Name     :F:\ACM\2016ACM\BestCoder\BC81\B.cpp
************************************************ */

#include <stdio.h>
#include <string.h>
#include <iostream>
#include <algorithm>
#include <vector>
#include <queue>
#include <set>
#include <map>
#include <string>
#include <math.h>
#include <stdlib.h>
#include <time.h>
using namespace std;

char str[1000010];
int num[30];

int main()
{
    //freopen("in.txt","r",stdin);
    //freopen("out.txt","w",stdout);
    int T;
    int k;
    scanf("%d", &T);
    while(T--) {
        scanf("%s%d",str,&k);
        memset(num,0,sizeof(num));
        int l = 0;
        int cnt = 0;
        long long ans = 0;
        for(int i = 0; str[i];i++) {
            int t = str[i]-'a';
            num[t]++;
            if(num[t] == 1)cnt++;

            while(cnt >= k) {
                num[str[l]-'a']--;
                if(num[str[l]-'a'] == 0)cnt--;
                l++;
            }

            ans += l;
        }
        printf("%I64d\n",ans);
    }
    return 0;
}