#include <iostream>
#include <cstdio>
using namespace std;
const int N = 1E5 + 10;
int s[N];
int main(){
    int n, m;
    cin >> n >> m;
    for(int i = 1; i <= n; i ++ )   scanf("%d", &s[i]);
    for(int i = 1; i <= n; i ++ )   s[i] += s[i - 1];
    int i, j;
    i = j = 1;;
    int vmin = 0x3f3f3f;
    while(i <= j && j <= n){
        int value = s[j] - s[i - 1];
        if(value < m || j == i)   j ++ ;          
        else{
            vmin = min(vmin, value - m);
            i ++ ;
        }
    }
    i = j = 1;
    while(i <= j && j <= n){
        int value = s[j] - s[i - 1];
        if(value - m == vmin)   cout << i << "-" << j << endl; 
        if(value <= m || j == i)   j ++ ;
        else    i ++ ;
    }
    return 0;
}