#23877: jameslee
91xb30@ms.mingdao.edu.tw
(X102 30黃冠穎)
學校
:
不指定學校
編號 : 129581
來源 : [114.42.92.10]
最後登入時間 ：
2022-10-03 20:29:39
t=int(input())
l=input()
c=[]
count=0
for i in range(len(l)):
if i==0:
count+=1
continue
if l[i].isupper():
if l[i-1].isupper():
count+=1
else:
c.append(count)
count=1
elif l[i].islower():
if l[i-1].islower():
count+=1
else:
c.append(count)
count=1
c.append(count)
count=0
su=0
for i in range(len(c)):
if c[i]>t:
count+=1
if su<count:
su=count
count=1
elif c[i]==t:
count+=1
elif c[i]<t:
count=0
if su<count:
su=count
print(su*t)
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