#include <cstdio>
#include <cmath>
#include <cstring>
#include <ctime>
#include <iostream>
#include <algorithm>
#include <set>
#include <vector>
#include <sstream>
#include <queue>
#include <typeinfo>
#include <fstream>
#include <map>
#include <iomanip>
typedef long long ll;
using namespace std;
//freopen("D.in","r",stdin);
//freopen("D.out","w",stdout);
#define sspeed ios_base::sync_with_stdio(0);cin.tie(0)
#define dbg(a) cout<<a<<endl
#define clr(a) memset(a,0,sizeof(a))
#define maxn 10001
#define mod 1000000007
#define eps 1e-9
#define inf 0x7fffffff
int least[1000010];
char a[1000010];
int flag[30];
int main()
{
    int T;
    scanf("%d",&T);
    while (T--)
    {
        scanf("%s",a);
        int n = strlen(a);
        int k;
        scanf("%d",&k);
        clr(flag);
        int s= 0,t=0;
        int num = 0;
        while (1)
        {
            while (t<n&&num<k)
            {
                if (flag[a[t++]-'a']++==0)
                {
                    num++;
                }
            }
            if (num<k)
            {
                for(;s<n;s++)
                    least[s]=n+1;
                break;
            }
            least[s]=t;
            if (--flag[a[s++]-'a']==0)
            {
                num--;
            }
        }
        int i;
//        for (i=0;i<n;i++)
//            cout<<least[i]<<endl;
        ll res =0;
        for (i=0;i<n;i++)
        {
            res += n-least[i]+1;
        }
        printf("%I64d\n",res);
    }
    return 0;
}