APL, 24 bytes
⎕A⍳'RQCKAGSIFEBPNHDLOMJ'
How?
⎕A ⍝ 'ABC...
⍳ ⍝ indices of
'RQCKAGSIFEBPNHDLOMJ' ⍝ ← this vector
APL, 24 bytes
⎕A⍳'RQCKAGSIFEBPNHDLOMJ'
APL, 24 bytes
⎕A⍳'RQCKAGSIFEBPNHDLOMJ'
How?
⎕A ⍝ 'ABC...
⍳ ⍝ indices of
'RQCKAGSIFEBPNHDLOMJ' ⍝ ← this vector