Read the Abacus (Part 1: Russian Schoty)

The Russian schoty is type of abacus (counting tool) that is used by sliding threaded beads along horizontal wires. An example schoty would have 7 wires, each holding 10 beads. Each bead, when moved to the left, would count as 1 unit. Starting from the bottom wire and moving up, the units increase by a factor of 10. If we use "O" for a bead and "-" to show the wire, we can represent the schoty as follows:

---OOOOOOOOOO  millions
---OOOOOOOOOO  hundred-thousands
---OOOOOOOOOO  ten-thousands
---OOOOOOOOOO  thousands
---OOOOOOOOOO  hundreds
---OOOOOOOOOO  tens
---OOOOOOOOOO  ones

To read the number, we count the beads on the left-hand side of each wire. In the example below, the number is 501264:

---OOOOOOOOOO  0
OOOOO---OOOOO  5
---OOOOOOOOOO  0
O---OOOOOOOOO  1
OO---OOOOOOOO  2
OOOOOO---OOOO  6
OOOO---OOOOOO  4

Given a list of strings representing each wire in the schoty, return the number being displayed.

Examples

schoty([
  "---OOOOOOOOOO",
  "---OOOOOOOOOO",
  "---OOOOOOOOOO",
  "OOO---OOOOOOO",
  "O---OOOOOOOOO",
  "OOOOOOOOO---O",
  "OO---OOOOOOOO"
]) ➞ 3192

schoty([
  "OO---OOOOOOOO",
  "O---OOOOOOOOO",
  "OOOOO---OOOOO",
  "---OOOOOOOOOO",
  "---OOOOOOOOOO",
  "---OOOOOOOOOO",
  "---OOOOOOOOOO"
]) ➞ 2150000

Notes

This challenge ignores the traditional 4-bead wires used for quarter-ruble and quarter-kopek calculations.