pro 3

#include<cstdio>
#define i64 long long
#define rep(i,a,b) for (register int i=a;i<=b;i++)
using namespace std;
int s[26];
char c;
int main()
{
	for (c=getchar();c!=10;c=getchar())
		if (c>=65 && c<=90) s[c-65]++;
			else if (c>=97 && c<=122) s[c-97]++;
	c=65;
	for (int i=0;i<26;i++,c++)
		if (s[i]) printf("%c: %d\n",c,s[i]);
	return 0;
}