def minimum_diff_ele(arr):
    arr=sorted(arr)
    size=len(arr)
    min_diff = 9999*999

    for i in range(size-1):
        if(arr[i+1]- arr[i] < min_diff):
            min_diff = arr[i+1]- arr[i]
    return min_diff


arr=[ 5, 32 , 45, 4, 12, 18, 25]
print("Minimum difference between elements of an array is",minimum_diff_ele(arr))