1557: 数数字
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Description
在一串字符串中找到有多少个a;
该字符串是"sdgatfyrahbgfcavduhafgtbayrnagcjduybafufbadjchgafbjaufrngdeartyarrshgdfahgdfhahjfdhgayffaajkhvsdkfajvdfajgfhja"
该字符串是"sdgatfyrahbgfcavduhafgtbayrnagcjduybafufbadjchgafbjaufrngdeartyarrshgdfahgdfhahjfdhgayffaajkhvsdkfajvdfajgfhja"
Input
无
Output
字符串中a的个数。