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