चंद्रयान-2,

 THE An avid hiker keeps meticulous records of their hikes. During the last hike that took exactly  steps, for every step it was noted if it was an uphill, , or a downhill,  step. Hikes always start and end at sea level, and each step up or down represents a  unit change in altitude. We define the following terms:

• A mountain is a sequence of consecutive steps above sea level, starting with a step up from sea level and ending with a step down to sea level.
• A valley is a sequence of consecutive steps below sea level, starting with a step down from sea level and ending with a step up to sea level.

Given the sequence of up and down steps during a hike, find and print the number of valleys walked through.

Example

 

The hiker first enters a valley  units deep. Then they climb out and up onto a mountain  units high. Finally, the hiker returns to sea level and ends the hike.

Function Description

Complete the countingValleys function in the editor below.

countingValleys has the following parameter(s):

• int steps: the number of steps on the hike
• string path: a string describing the path

.Returns

• int: the number of valleys traversed

.Input Format

The first line contains an integer , the number of steps in the hike.
The second line contains a single string , of  characters that describe the path.

.Constraints

.Sample Input

8
UDDDUDUU

.Sample Output

1

.Explanation

If we represent _ as sea level, a step up as /, and a step down as \, the hike can be drawn as:

_/\      _
   \    /
    \/\/

The hiker enters and leaves one valley.

.SOLVE.....👇👇👇👇👇👇👇😎😎😎😎😎😎👍

def count_valleys(n, steps):

    numbe_vally = 0

    level = 0

    for i in steps:

        if i == 'U':

            level+= 1

        else:

            if level == 0: 

                numbe_vally+= 1

            level-= 1

    return numbe_vally

n = int(input().strip())

steps = input().strip()

print(count_valleys(n,steps))