#include <stdio.h>
 
int main(void) {
	//scan data
	int data[20][20];
	int n,m;
	scanf("%d%d",&n,&m);
	for(int i=0;i<n;i++)
		for(int j=0;j<m;j++)
			scanf("%d",&data[i][j]);
 
	//find Max
	int Max[20];
	int printMax=0;
	for(int i=0;i<n;i++){
		Max[i]=data[i][0];
		for(int j=0;j<m;j++)
			Max[i]=(data[i][j]>Max[i])?data[i][j]:Max[i];
		printMax+=Max[i];
	}
 
	//print result
	printf("%d\n",printMax);
	int print=0;
	for(int i=0;i<n;i++)
		if(printMax%Max[i]==0){
			if(print) printf(" ");
			printf("%d",Max[i]);
			print=1;
		}
	if(!print)
		printf("-1");
	return 0;
}
 

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

15 15
6 3 2 1 1 1 5 5 5 6 6 6 7 8 256
2 7 9 256 1 1 5 5 5 6 6 6 7 8 9 
4 7 1 1 1 1 5 5 5 256 6 6 7 8 9 
9 5 3 1 1 1 5 5 256 6 6 6 7 8 9 
9 5 3 1 1 1 5 5 256 6 6 6 7 8 9 
9 5 3 1 1 1 5 5 256 6 6 6 7 8 9 
9 5 3 1 1 1 5 5 256 6 6 6 7 8 9 
9 5 3 1 1 1 5 5 256 6 6 6 7 8 9 
9 5 3 1 1 1 5 5 256 6 6 6 7 8 9 
9 5 3 1 1 1 5 5 256 6 6 6 7 8 9 
9 5 3 1 1 1 5 5 256 6 6 6 7 8 9 
2 5 3 1 1 1 5 5 256 6 6 6 7 8 9 
9 5 3 1 1 1 5 5 255 6 6 6 7 8 9 
1 5 3 1 1 1 5 5 256 6 6 6 7 8 9 
9 5 3 1 1 1 5 5 256 6 6 6 7 8 9