简单题。

#include<cstdio>
#include<cstring>
#include<cmath>
#include<vector>
#include<map>
#include<stack>
#include<queue>
#include<string>
#include<iostream>
#include<algorithm>
using namespace std; char s[+];
string ans[+];
int tot; bool g(char c)
{
if(c>='a'&&c<='z') return ;
if(c>=''&&c<='') return ;
if(c>='A'&&c<='Z') return ;
return ;
} int main()
{
gets(s);
for(int i=;s[i];i++)
if(s[i]>='A'&&s[i]<='Z') s[i]=s[i]-'A'+'a';
string f=""; tot=;
for(int i=;s[i];i++)
{
if(g(s[i])) f=f+s[i];
else
{
if(f=="") continue;
ans[tot++]=f;
f="";
}
}
if(f!="") ans[tot++]=f;
sort(ans,ans+tot);
int now=,pre=;
string out;
int num=; while()
{
if(ans[now]==ans[pre]) now++;
else
{
if(now-pre>num)
{
num=now-pre;
out=ans[pre];
}
pre=now;
}
if(pre==tot) break;
} cout<<out<<" "<<num<<endl;
return ;
}

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