第一题解答参考代码:
x={}
while True:
inp=input().lower()
if inp=='':
break
if inp[-1] in x:
x.setdefault(inp[-1]).append(inp)
else:
x[inp[-1]]=[inp]
print(x)
第二题:
sent='Nanjing University of Finance and Economics,School of Information Engineering'
new=[]
for x in sent.split():
cnt=x.count('n')
if cnt>=2:
new.append(x)
new_sent=' '.join(sorted(new))
print(new_sent)
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