Problem: The array a with n integers is given. Let's call the sequence of one or more consecutive elements in a segment. Also let's call the segment k-good if it contains no more than k different values.

Find any longest k-good segment.

As the input/output can reach huge size it is recommended to use fast input/output methods: for example, prefer to use scanf/printf instead of cin/cout in C++, prefer to use BufferedReader/PrintWriter instead of Scanner/System.out in Java.

Input

The first line contains two integers n, k (1 ≤ k ≤ n ≤ 5·105) — the number of elements in a and the parameter k.

The second line contains n integers ai (0 ≤ ai ≤ 106) — the elements of the array a.

Output

Print two integers l, r (1 ≤ l ≤ r ≤ n) — the index of the left and the index of the right ends of some k-good longest segment. If there are several longest segments you can print any of them. The elements in a are numbered from 1 to n from left to right.

Examples

Input

5 5
1 2 3 4 5


Output

1 5


Input

9 3
6 5 1 2 3 2 1 4 5


Output

3 7


Input

3 1
1 2 3


Output

1 1

Solution (in PYTHON3):

Solution:
import sys
count = int(input())
perls = list(input().split(' '))
if len(perls)<2:
    print('-1')
    sys,exit()
start=0
cur = 0
flag=0
slide=set()
goodlist=list()
for i in perls:
    if i in slide:
        goodlist.append([start+1,cur+1])
        start=cur+1
        slide.clear()
        flag=1
    else:
        slide.add(i)
        flag=0
    cur+=1
if  len(goodlist)==0:
    print('-1')
    sys.exit()
if flag==0:
    goodlist[-1][1]=len(perls)
print(len(goodlist))
for i in goodlist:
    print('{} {}'.format(i[0],i[1]))