#include<iostream>
#include<cstring>

using namespace std;

const int N=100010,INF=1e9;

int n,m;
int s[N]; //前缀和

int main()
{
    scanf("%d%d",&n,&m);
    for(int i=1;i<=n;i++)
    {
        scanf("%d",&s[i]);
        s[i]+=s[i-1];
    }

    int res=INF;
    for(int i=1,j=0;i<=n;i++) //j,i，双指针
    {
        while(s[i]-s[j+1]>=m) j++;
        if(s[i]-s[j]>=m) res=min(res,s[i]-s[j]);
    }

    for(int i=1,j=0;i<=n;i++)
    {
        while(s[i]-s[j+1]>=m) j++;
        if(s[i]-s[j]==res) printf("%d-%d\n",j+1,i);
    }
    return 0;
 }