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, minimumIndex(new ArrayList<>(Arrays.asList(1,2,2,2))));
}
@Test
public void test2() {
    assertEquals(4, minimumIndex(new ArrayList<>(Arrays.asList(2,1,3,1,1,1,7,1,2,1))));
}
@Test
public void test3() {
    assertEquals(-1, minimumIndex(new ArrayList<>(Arrays.asList(3,3,3,3,7,2,2))));
}

}