This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
int main()
{
	int n,K;
	cin>>n>>K;
	vector<int>a(n);
	for(int i=0;i<n;i++)cin>>a[i];
	for(int i=0;i<n;i++){
		for(int j=i;j<n;j++){
			int c = 1;
			int len = (j-i+1);
			for(int k=j+1;k<n;k++){
				if(a[k] != a[k-len])break;
				if((k-j)%len == 0)c++;
			}
			if(c >= K){
				cout<<len<<'\n';
				for(int x=i;x<=j;x++)cout<<a[x]<<" ";
				return 0;	
			}
		}
		
	}
	cout<<-1;
}
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