class a{public static void main(String[]t)throws Exception{int[]a=new int[256];int i;while((i=System.in.read())!=-1)a[i]++;for(char z=64;++z<123;)if(z<91|z>96)System.out.printf(z+":%3d\n",a[z]);}}
Note that non-ascii characters in the above source code will be escaped (such as \x9f).