Counts of Uniq value along with date from filename

Shell Programming and Scripting
1

I have different files with same fileformat with filenames like '20080103*CUST*.IMP'. ( yyyymmdd)
File contains data as below said:

1200|aaa
1200|bbb
1200|ccccc
1201|dddddd
1201|ee
1201|ff
1201|hhhhh
1201|kkk
1203|gggg

Question : I need to get the date from the filename and below that
count of uniq values in first column.
Example:

20080103
1200 3
1201 5
1203 1

Thanks in Advance.
Hope someone would help me on this

2 
awk 'NR>1 && FILENAME != f {
print substr(f,1,8)
for (k in x)
  print k, x[k]
split("",x)
}
{ x[$1]++; f = FILENAME }
END {
print substr(f,1,8)
for (k in x)
  print k, x[k]
split("",x)
}' FS="|" *.IMP