R=lambda:map(int,raw_input().split())
n,k=R()
c=[0]*(1<<20)
a=R()
i,j=0,0
x,y=0,0
u,v=0,0
while j<n:
  c[a[j]]+=1
  if 1==c[a[j]]:
    y+=1
  j+=1
  while y>k:
    c[a[i]]-=1
    if 0==c[a[i]]:
      y-=1
    i+=1
  if j-i>x:
    x,u,v=j-i,i,j
print u+1,v