/*  moveavp.c  */

#include <stdio.h>

int main(void)
{
    int i,n,na,nd,nc;
    double x[101],y[101];
    double sum;

    scanf("%d",&n);
    scanf("%d",&na);

    nd = na/2;

    for (i=0; i<n; i++)  {
        scanf("%lf",&x[i]);
    }

    for (i=0; i<n; i++)  {
        sum=0.0;
        nc=0;
        for (int j = i - nd; j <= i + nd; j++)  {
            if ((j >= 0) && (j < n))
            {
                sum = sum + x[j];
                nc++;
            }
        }
        y[i] = sum / nc;
        printf("%d\t%f\n",i+1,y[i]);
    }

    return 0;
}