using C=System.Console;class P{static void Main(){int[]s=new int[999];for(int i;(i=C.Read())>0;)s[i]++;for(char c='@';++c<'{';)C.Write(s[c]>0?"{0}:{1,3}\n":"",c,s[c]);}}
Note that non-ascii characters in the above source code will be escaped (such as \x9f).