#include<stdio.h>
#include<math.h>
#include<string.h>
 
 
void merge_chem(FILE * inp1, FILE* inp2, FILE* outp);
 
int main(void)
{ 
  FILE *inp1, *inp2, *outp;
  inp1 = fopen("chem1.txt", "r");
  inp2 = fopen("chem2.txt", "r");
  outp = fopen("chem.out", "w");
 
  merge_chem(inp1,inp2,outp);
 
  fclose(inp1);
  fclose(inp2);
 fclose(outp);
        return 0;
}
 
void merge_chem(FILE * inp1, FILE* inp2, FILE* outp)
{
  int atomic_num[40], atomic_num2[40], i = 0, j = 0, m =0, status, status2;
  int k =0;
  double weight[40], weight2[40];
  char name[40][40], symbol[40][40], name2[40][40], symbol2[40][40];
 
   while(status != EOF)
   {
    status = fscanf(inp1, "%d%s%s%lf", &atomic_num[i], name[i], symbol[i], &weight[i]);
    i++;
   }
 
   i = i-1;
 
   while(status2 != EOF)
   { 
    status2 = fscanf(inp2, "%d%s%s%lf", &atomic_num2[m], name2[m], symbol2[m], &weight2[m]);
    m++;
   }
   m  = m-1;
 
 
   for(k = 0; k < m; k++)
       fprintf(outp,"%d  %s  %s  %.2f\n", atomic_num2[k], name2[k], symbol2[k], weight2[k]);    
   for(j = 0; j < i; j++)
       fprintf(outp,"%d  %s  %s  %.2f\n", atomic_num[j], name[j], symbol[j], weight[j]);    
}