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	`1`	`+#!/bin/python3`
	`2`	`+`
	`3`	`+import math`
	`4`	`+import os`
	`5`	`+import random`
	`6`	`+import re`
	`7`	`+import sys`
	`8`	`+`
	`9`	`+# Complete the countingValleys function below.`
	`10`	`+def countingValleys(n, s):`
	`11`	`+ level=valley=0`
	`12`	`+ for i in range(n):`
	`13`	`+ if(s[i]=='U'):`
	`14`	`+ level+=1`
	`15`	`+ if(level==0):`
	`16`	`+ valley+=1`
	`17`	`+ else:`
	`18`	`+ level-=1`
	`19`	`+`
	`20`	`+ return valley`
	`21`	`+`
	`22`	`+if __name__ == '__main__':`
	`23`	`+ fptr = open(os.environ['OUTPUT_PATH'], 'w')`
	`24`	`+`
	`25`	`+ n = int(input())`
	`26`	`+`
	`27`	`+ s = input()`
	`28`	`+`
	`29`	`+ result = countingValleys(n, s)`
	`30`	`+`
	`31`	`+ fptr.write(str(result) + '\n')`
	`32`	`+`
	`33`	`+ fptr.close()`

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