Mrs$.$ Sonia Nexus has $2021$ earned income for RRSP purposes of $$35,600.$

She is not a member of an RPP or a DPSP$.$ At the end of $2021,$ her

unused RRSP deduction room was $$4,200$ and she has no un deducted

contributions. During $2022,$ she contributes $$5,000$ to her RRSP and

makes an RRSP deduction of $$4,100.$

What is the undeducted contribution at the end of $2022?$