I can not partition the card, explain:

following the guidance of paragraph 3 of partitioning, I digit sfdisk-uM / dev/mmcblk1 <<EOF and hit enter once sent me down this symbol > after I type ,<2100000>, C resubmit
then obviously
, L sending
,, Sending
,, Sending
EOF sent

Once you press Enter after the partitioning eof me but eventually I sfdisk bad input, where am I wrong? I have a memory card, panasonic 4gb class 6 hc formatted fat32