#include <stdio.h>
int strlen(char *str)
{
    int c=0;
    while( *str++ != '\0' )
        c++;

    return c;
}
int strcmp(char *a, char *b)
{
    for (; *a != '\0' || *b != '\0' ; *a++,*b++)
    {
        if( *a > *b)
            return 1;
        else if( *a < *b)
            return -1;
    }
    return 0;
}
int strtok(char *str, char *delimiters, char tokens[500][127])
{
    int i,j,z=0,num=0,flag=1;

    for(i=0; str[i] ; i++)
    {
        for(j=0; delimiters[j] ; j++)
        {
            if(str[i] == delimiters[j])
            {
                tokens[num][z]='\0';
                num++;
                z=0;
                flag=0;
                break;
            }
        }

        if(flag)
        {
            tokens[num][z]=str[i];
            z++;
        }
        flag=1;
    }
    return num+1;
}
int main()
{
    char delimiters[] = ".,!:;? ";
    char common_words[11][10] = {"a", "an", "the", "am", "is", "are", "of", "in", "to", "from", "at"};
    char para[1000];
    char tokens[500][127];

    gets(para);

    int num = strtok(para, delimiters, tokens);
    int i,j,c=0,sum=0;

    for(i=0; i<num; i++)
    {
        int flag=1;
        for(j=0; j<11 ; j++)
        {
            if( strcmp(tokens[i],common_words[j])==0 || strlen(tokens[i])==0 )
            {
                flag=0;
                break;
            }
        }
        if(flag)
        {
            c++;
            sum += strlen(tokens[i]);
        }
    }

    printf("%d \n%.2lf", c, sum/(double)c);
    return 0;
}