import static org.junit.jupiter.api.Assertions.*;
import org.junit.jupiter.api.Test;
import java.util.List;
import java.util.Arrays;
import java.util.ArrayList;
public class Main {
    //Program start
    
    //Program end

    @Test
public void test1() {
    assertEquals(2, findMinimumOperations("abc", "abb", "ab"));
}
@Test
public void test2() {
    assertEquals(-1, findMinimumOperations("dac", "bac", "cac"));
}

}