Counting Valleys.py

import math
import os
import random
import re
import sys
def countingValleys(steps, path):
    valleys = 0
    cur_level = 0
    for steps in path:
        if(steps == 'U'):
            cur_level += 1
            if(cur_level == 0):
                valleys += 1
        elif(steps == 'D'):
            cur_level -= 1
    return(valleys)

if __name__ == '__main__':
    fptr = open(os.environ['OUTPUT_PATH'], 'w')

    steps = int(input().strip())

    path = input()

    result = countingValleys(steps, path)

    fptr.write(str(result) + '\n')

    fptr.close()