class Solution:
    def sumOfWaviness(self, num1: int, num2: int) -> int:
        total_waviness = 0
        for i in range(num1, num2 + 1):
            s = str(i)
            n = len(s)
            if n < 3:
                continue
            for j in range(1, n - 1):
                if s[j] > s[j-1] and s[j] > s[j+1]:
                    total_waviness += 1
                elif s[j] < s[j-1] and s[j] < s[j+1]:
                    total_waviness += 1
        return total_waviness