#include <stdio.h>



int *pX = nullptr;
int N = 0;



int main ( void ) {

	int BufNums;


	scanf ( "%d" , &BufNums );

	pX = new int [ BufNums ];
	N = 0;
	int Current;
	bool bExistNumber;

	for ( int i = 0; i < BufNums; i++ ) {
		scanf ( "%d" , &Current);
		bExistNumber = false;

		/*for ( int j = 0; j < N; j++ ) {
			if ( Current == *( pX + j ) ) {
				bExistNumber = true;
				break;
			}
		}*/

		if ( bExistNumber == false ) {
			*( pX + N ) = Current;
			N++;
		}
	}



	if ( N != 1 ) {

		int MinNum;
		int buf;
		for ( int i = 0; i < (N-1); i++ ) {

			MinNum = i;
			for ( int j = i+1; j < N; j++ ) {
				if ( *( pX + i )  > *( pX + j ) ) MinNum = j;
			}

			buf = *( pX + i );
			*( pX + i ) = *( pX + MinNum );
			*( pX + MinNum ) = buf;
		}

		int diff = 0 , diffbuf;
		
		diff = *( pX + 0 ) - *( pX +  1 );
		if ( diff < 0 )diff *= -1;

		for ( int i = 1; i < N - 1; i++ ) {
			diffbuf = *( pX + i ) - *( pX + i + 1 );
			if ( diffbuf < 0 )diffbuf *= -1;
			if ( ( diff == 0 ) || ( diff > diffbuf ) ) diff = diffbuf;
		}


		printf ( "%d\n" , diff );
	} else {
		printf ( "0\n" );

	}


	delete []pX;

	return 0;
}