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add 771.py

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	`1`	`+class Solution(object):`
	`2`	`+ def numJewelsInStones(self, J, S):`
	`3`	`+ """`
	`4`	`+ :type J: str`
	`5`	`+ :type S: str`
	`6`	`+ :rtype: int`
	`7`	`+ """`
	`8`	`+ jewel_cnt = 0`
	`9`	`+ for j in set(J):`
	`10`	`+ jewel_cnt += S.count(j)`
	`11`	`+ return jewel_cnt`

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