n = int(input())
seq = input().split()

int_seq = [int(i) for i in seq]
int_seq.sort()

seq_set = set(int_seq)
int_seq_set = list(seq_set)

num = len(int_seq_set)

minimum = int_seq_set[1] - int_seq_set[0]
for i in range(num - 1):
    diff = int_seq_set[i+1] - int_seq_set[i]
    if diff < minimum:
        minimum = diff

print(minimum)