struct vec

#include <stdio.h>
#include <stdlib.h>
#include <math.h>

struct vect {
    int x;
    int y;
    int z;
};

int main() {
    int n;
    char c;
    if (scanf("%d%c", &n, &c) == 2 && c == '\n') {
        int f = 1;
        //int x, y, z;
        struct vect *vects = malloc(n * sizeof(int));
        //int *arr = malloc(n * sizeof(int));
        char s;
        for (int i = 0; i < n; i++) {
            if (scanf("%d %d %d%c", &vects[i].x, &vects[i].y, &vects[i].z, &s) == 4 && s == '\n') {
                continue;
            } else {
                f = 0;
                printf("n/a");
                break;
            }
        }
        if (f == 1)
            for (int i = 0; i < n; i++) {
                printf("%d %d %d ", vects[i].x, vects[i].y, vects[i].z);
                printf("%lf\n", sqrt(vects[i].x*vects[i].x+ vects[i].y*vects[i].y + vects[i].z*vects[i].z));
            }
        free(vects);
    } else {
        printf("n/a");
    }
    return 0;
}