You said you left the US in December so you were not a resident at the end of the year. I assume by leaving you meant you permanently left the US, in which case you would be dual-status.
You must file Form 1040-NR, U.S. Nonresident Alien Income Tax Return if you are a dual-status taxpayer who gives up residence in the United States during the year and who is not a U.S. resident on the last day of the tax year. Write "Dual-Status Return" across the top of the return. Attach a statement to your return to show the income for the part of the year you are a resident. You can use Form 1040, U.S. Individual Income Tax Return as the statement, but be sure to write "Dual-Status Statement" across the top.
Taxation of Dual-Status Aliens
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