标准模板4

#include<iostream>
#include<map>
#include<cctype>
using namespace std;
int main()
{
map<char,int>s;
char c;
do{
cin>>c;
if(isalpha(c)){
c=tolower(c);
s[c]++;
}
}while(c!='.');
for(map<char,int>::iterator iter=s.begin();iter!=s.end();++iter)
cout<<iter->first<<""<<iter->second<<" ";
cout<<endl;
return 0;

}