各位大佬看看这个问题，Python怎么解决这个需求？

Question

需求：1.由用户输入输入一串字符，通过程序筛选出这个字符串是否含有'f','r','i','e','n','d',有的话拼接起来组成‘friend’，并且打印到屏幕上。

          2.统计出这一串字符可以组成几个'friend'。

Answer 1

zifu=input("Please input your zifu:")a=zifu.count("f")b=zifu.count("r")c=zifu.count("i")d=zifu.count("e")e=zifu.count("n")f=zifu.count("d")g=[a,b,c,d,e,f]h=min(g)print(h*"frined")

Answer 2

DZORURUJZWFHGMCZQZKXAFZORRFXAUKKWTZQNGHUNQAWJSIIBPFXAAPPCVEXLIOHREMBHQKJZMIBRMFOERHEBEKQRAMFLUEAHXZCIJCSCICYHDNQVVICWEYRKZFKFIEAUQYEDMNZDJJMCZIZCZFTZTZMMSXTSBQKDJPCSDDJMPXNBHNTNWTBIPYZSSXZCSIOLIVRIHDJSYOOFMVAJMIBXNUKWMGVBKQNZPFIPFIKDAQDGNBHRQNACRRLUEYYDFQZUAHRHNNJSFORHXEISSVDJDNQZZAXGNJFBIHEOVLEEAMSIISOIERFJFLVCJWKDJMFLRBEOQWMCSAGKCLVILOHUREBRHERKKUDETWMNWWFUUALHASTTPMPVVUMZXGMMPMSCQZCVICOISDCXAZCFCDHEYRGWMCBIOUJGPABBEXNQQQGJWFEEISYILDPIFIISILFBVUSEFNMZTKGATRHGGJZWTKEAKCZSOERHHBADSIIIVOERRKBNGGMOYEBKUKJMPSSPSSCDMHTJZNDAVOIYUZZYCZTDJZEHHHDQNTTDWATEAGGQJWMUCLJSYLYMSSCBUQODXTJPHAILEBRYUFFOOKDNNTKKNXXQQNMSPTWJPPFWZOYUEKQTDWJTMDWFFOVIBFLJPCNGKNDXLKDKDGJMFSITGTCQGGOBBAWFWPCWJCPPVYNDSPLBKGVSHQMVLAQTCSBIXNWSPLBXUKGVRTKGXNJFBACTOSNDADAPAQZVTCFVROKWSCMIYUCFOEZPRNDMVYUKGDTQGILOEUKTKZWFCEHXAQTMIXODGDFVLAUDZCGVRUCFOIYURNJMOKNQNPLUDSULUQANQXTJSCSHKAUQMWMWSBRORXGIFIYGQTIFKBDTWFIRHWF

Answer 3

第一个要求用正则匹配来过滤，第二个也可以用正则匹配，然后count++