| A | B | C | |
| ## | Ltr | Formula | |
| 1 | 1 | A | =LEFT(ADDRESS(1,A1,4),LEN(ADDRESS(1,A1,4))-1) |
| 2 | 2 | B | =LEFT(ADDRESS(1,A2,4),LEN(ADDRESS(1,A2,4))-1) |
| 3 | 3 | C | =LEFT(ADDRESS(1,A3,4),LEN(ADDRESS(1,A3,4))-1) |
| 4 | 11 | K | =LEFT(ADDRESS(1,A4,4),LEN(ADDRESS(1,A4,4))-1) |
| 5 | 12 | L | =LEFT(ADDRESS(1,A5,4),LEN(ADDRESS(1,A5,4))-1) |
| 6 | 13 | M | =LEFT(ADDRESS(1,A6,4),LEN(ADDRESS(1,A6,4))-1) |
| 7 | 23 | W | =LEFT(ADDRESS(1,A7,4),LEN(ADDRESS(1,A7,4))-1) |
| 8 | 24 | X | =LEFT(ADDRESS(1,A8,4),LEN(ADDRESS(1,A8,4))-1) |
| 9 | 25 | Y | =LEFT(ADDRESS(1,A9,4),LEN(ADDRESS(1,A9,4))-1) |
| 10 | 26 | Z | =LEFT(ADDRESS(1,A10,4),LEN(ADDRESS(1,A10,4))-1) |
| 11 | 27 | AA | =LEFT(ADDRESS(1,A11,4),LEN(ADDRESS(1,A11,4))-1) |
| 12 | 49 | AW | =LEFT(ADDRESS(1,A12,4),LEN(ADDRESS(1,A12,4))-1) |
| 13 | 50 | AX | =LEFT(ADDRESS(1,A13,4),LEN(ADDRESS(1,A13,4))-1) |
| 14 | 51 | AY | =LEFT(ADDRESS(1,A14,4),LEN(ADDRESS(1,A14,4))-1) |
| 15 | 52 | AZ | =LEFT(ADDRESS(1,A15,4),LEN(ADDRESS(1,A15,4))-1) |
| 16 | 53 | BA | =LEFT(ADDRESS(1,A16,4),LEN(ADDRESS(1,A16,4))-1) |
| 17 | 54 | BB | =LEFT(ADDRESS(1,A17,4),LEN(ADDRESS(1,A17,4))-1) |
| 18 | 55 | BC | =LEFT(ADDRESS(1,A18,4),LEN(ADDRESS(1,A18,4))-1) |
| 19 | 56 | BD | =LEFT(ADDRESS(1,A19,4),LEN(ADDRESS(1,A19,4))-1) |
| 20 | 57 | BE | =LEFT(ADDRESS(1,A20,4),LEN(ADDRESS(1,A20,4))-1) |
| 21 | 256 | IV | =LEFT(ADDRESS(1,A21,4),LEN(ADDRESS(1,A21,4))-1) |