run per chromsome - error - Unknown process directive: $

[complexgenome]

I have the below code. I'd like to run lancet per chromosome. I create a channel, have hard coded tumor and normal bam files.
This is a test code, however, I'm unable to declare output here. I'm unable to resolve the error generated:

Unknown process directive: $

process check {

input:
    val chromosome

output: 
         "CHR"${chromsome}".lancet.vcf"
script:
"""
echo "hello ${chromosome}\n"

ml lancet

lancet --tumor tiny_tumor.sorted.markdup.recal.bam --normal tiny_normal.sorted.markdup.recal.bam --ref "Homo_sapiens_assembly38.fasta.gz" --reg "chr"$chromosome --num-threads 1 > "CHR"${chromosome}".lancet.vcf" 
"""
}
workflow {

chr=Channel.of( 1..22, 'X', 'Y' )

check(chr).view()
}