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

int main(int argc, char** argv[])
{
    FILE *fin = fopen(argv[3], "r");
    char strF[10000],line[10000];
    char grep[strlen(argv[2])];
    char str[strlen(argv[2])];
    int i = 0, j = 0;
    if(argv[1] == "-cat")
    {
        while(scanf("%c", &strF[i]) != EOF)
        {
            i++;
        }
    }
    else
    {
        while(fscanf(fin, "%c", &strF[i]) != feof(fin))
        {
            i++;
        }
    }

    strcpy(grep, argv[2]);
    for(i = 0; i < strlen(strF); i++)
    {
        for(j = 0; j < strlen(strF); j++)
        {
            if(strF[j + i] == '\n')
            {
                i += j;
                break;
            }
            else
            {
                line[j] = strF[j + i];
            }

        }
        for(int s = 0; s < strlen(line); s++)
        {
            for(int s1 = 0; s1 < strlen(grep); s1++)
            {
                str[s1] = line[s1 + s];
            }
            if(strncmp(grep, str, strlen(grep)) == 0)
            {
                printf("%s\n", line);
                break;
            }

        }
        memset(line, 0, strlen(line));
     }
    return 0;
}