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英语阅读真是令人头痛的东西。可怜的子航想利用寒假时间突破英语难题。当他拿到一篇英语阅读时，他很好奇作者最喜欢用那些字母。

输入

一句30词以内的英语句子

输出

统计每个字母出现的次数

 

样例输入 复制

 

However,the British don't have a history of exporting their foodstuffs,which makes it difficult for restaurants in Hong Kong to source authentic ingredients.

样例输出 复制

a:6
b:1
c:4
d:4
e:12
f:7
g:4
h:10
i:13
k:2
l:1
m:1
n:9
o:12
p:1
r:10
s:9
t:15
u:5
v:2
w:2
x:1
y:1

 

#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 << endl;return 0;
}