#include <stdio.h>

void le_vetor(int seq[], int n){
	int i;
	for(i = 0; i < n; i++){
		scanf("%d", &seq[i]);
	}
}

void imprime_seq(int seq[], int n){
	int min, diff, i, j;
	min = 1000000;
	for(i = 0; i < n - 1; i++){
	    for(j = i + 1; j < n; j++){
	        diff = seq[i] - seq[j];
	        
	        if (diff < 0)
	            diff = -diff;
	        if(diff < min)
	            min = diff;
	        }
	      }
	      printf("%d\n", min);
	  }

int main(){
	int n, sequencia[10];
	scanf("%d", &n);
	
	le_vetor(sequencia, n);
	imprime_seq(sequencia, n);
    
	return 0;
}