# Parting the number
def num_parts(x):
    if x == 0:
        return []
    last_number = x%10
    x = (x-last_number)/10
    numar = [last_number]
    numar.extend(num_parts(x))
    return numar

# Joining it together
def join_num(arr):
    num = 0
    for i in arr[::-1]:
        num = num*10
        num += i
    return num

# Finds the next big number // Switching 2 of the parts
def next_bigger(x):
    arr = num_parts(x)
    for i in range(len(arr)):
        if i+1 >= len(arr):
            return -1
        if arr[i] > arr[i+1]:
            arr[i], arr[i+1] = arr[i+1], arr[i]
            return join_num(arr)
    return -1