N = input()
n = input()
m = n.split()
p = [int(i) for i in m]
a1 = p[1] - p[0]
for i, value in enumerate(p):
    if i == 0 or i == 1:
        pass
    else:
        b = value - p[i - 1]
        if b == 0:
            print("0")
            break
        elif b < a1:
            a1 = b
        else:
            pass
else:
    print(a1)
print(p[-1] - p[0])