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

int main()
{
    char strings[100][256];
    char current = 0;

    FILE* f = fopen("file.extension");

    while(!feof(f)){
        fscanf(f, "%s", strings[current]);
        if(strcmp(strings[current] + strlen(strings[current]) - 3, "ova") == 0)
            ++curent;
    }

    fclose(f);
}