1 #include <cstdio>
 2 #include <cstring>
 3 #include <cmath>
 4 #include <iostream>
 5 #include <algorithm>
 6 #include <string>
 7 #include <cstdlib>
 8 
 9 using namespace std;
10 
11 int main()
12 {
13     int num[30],len,i;
14     char buf[100010];
15     while(gets(buf)!=NULL)
16     {
17         memset(num,0,sizeof(num));
18         len=strlen(buf);
19         for(i=0;i<len;i++)
20         {
21             if(‘a‘<=buf[i]&&buf[i]<=‘z‘)
22                 num[buf[i]-‘a‘]++;
23         }
24         for(i=0;i<26;i++)
25             printf("%c:%d\n",‘a‘+i,num[i]);
26             printf("\n");
27     }
28     return 0;
29 }