search for: pqrtuwxi

I have three character strings represented below as seq1, seq2, and seq3. Each string has a reference character different from the other. Thus, for seq1, the reference character is U, seq2, S (3rd S from left where A is leftmost character) and for seq3 Y. seq1 = PQRTUWXYseq2 = AQSDSSDHRSseq3 = EEZYJKFFBHO I wish to generate a 3 by 26 matrix where 3 represent seq1, seq2, seq3 and 26 the letters of