The input contains 4 blocks in 3 stacks. From left to right:
- Stack 1 has 1 level.Level 1 has a green block.
- Stack 2 has 1 level.Level 1 has a red block.
- Stack 3 has 2 level. From bottom to top: level 1 has an blue block, level 2 has an orange block,
As such, for the question "What is the color of the block at stack 1, level 1?", the correct answer is "<Output> green".
<Output> green