Identify a seedling

in Plants
Please could someone identify this seedling for me please. The seed was like a small bean, slightly kidney shape and a pinky colour with brown markings. It sprouted quite quickly and now looks like this. Thank you.


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It was a mixed seed box from Lidl. I picked out the large seeds and sowed them individually. Then I sieved the rest and sowed the small seeds. The rest of the seeds I am going to sow into pots. (Instead of having summer bedding in them.) Pictures below. Thank you.
The picture on the box includes cosmos, those have finely divided leaves.