MIME type (noob)

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

/**
 * Auto-generated code below aims at helping you parse
 * the standard input according to the problem statement.
 **/
int main()
{
   char res[11];
    int t1,t2,a,y,b,c,x;
    char MIMEtype[9999][11],extension[9999][51];

    int N; // Number of elements which make up the association table.
    scanf("%d", &N); fgetc(stdin);
    int Q; // Number Q of file names to be analyzed.
    scanf("%d", &Q); fgetc(stdin);
    for (int i = 0; i < N; i++) {
        char EXT[11]; // file extension
        char MT[501]; // MIME type.
        scanf("%s%s", EXT, MT); fgetc(stdin);
        t1=strlen(EXT);
        t2=strlen(MT);
        //printf("%d %d\n",t1,t2);
        for (int j=0;j<t1;j++)
        MIMEtype[i][j]=EXT[j];
        for (int j=0;j<t2;j++)
        extension[i][j]=MT[j];
    }

    for (int i = 0; i < Q; i++) {
        char FNAME[501]; // One file name per line.
        fgets(FNAME,500,stdin); // One file name per line.
        int tam,temp=0;
        tam=strlen(FNAME);
        char *pos;
        int l;
        //printf("%d\n",tam);
        for (l=0;l<tam-1;l++)
            if (((int)FNAME[l])==46) break;
        //printf("%d\n",l);
        if (l!=tam-1){
        pos=strrchr(FNAME,'.')+1;
        //printf("%s",pos);
        if(strlen(pos)!=1)a=tam-strlen(pos);
            else a=0;
        }
        else a=0;

        if (a==0) printf("UNKNOWN\n");
        else {for(int c=0;c<strlen(pos)-1;c++){
                //printf("%c\n",FNAME[tam-strlen(pos)+c]);
               res[c]=FNAME[tam-strlen(pos)+c];temp++;}

              for(x=0;x<N;x++){
                  for(y=0;y<temp;y++){
                      //printf("%d %d\n",(int)res[y],(int)MIMEtype[x][y]);
                    if( (((int)res[y])!=((int)MIMEtype[x][y])) && (((int)res[y]+32)!=((int)MIMEtype[x][y]))&&(((int)res[y]-32)!=((int)MIMEtype[x][y])) )
                        break;
                  }
                if (y==temp) break;
              }
              //printf("%d\n",x);
              if (x==N) printf("UNKNOWN\n");
                else printf("%s\n",extension[x]);

            }
    }

    // Write an action using printf(). DON'T FORGET THE TRAILING \n
    // To debug: fprintf(stderr, "Debug messages...\n");

    // For each of the Q filenames, display on a line the corresponding MIME type. If there is no corresponding type, then display UNKNOWN.

    return 0;
}