#!/usr/bin/env tclsh
source ../prelude.tcl
set input stdin

proc roll-left lane {
    set prev {}
    while {$prev ne $lane} {
        set prev $lane
        #regsub -all {(O+)(\.+)} $lane {\2\1} lane
        regsub -all {(\.+)(O+)} $lane {\2\1} lane
    }
    return $lane
}

proc calc-load lane {
    set N [slen $lane]
    set load 0
    for {set i 0} {$i < $N} {incr i} {
        if {[string index $lane $i] eq "O"} {
            incr load [expr {$N - $i}]
        }
    }
    return $load
}

set map {}
while {[gets $input line] >= 0} {
    lappend map $line
}

set part1 0
foreach l [transpose $map] {
    set r [roll-left $l]
    set n [calc-load $r]
    puts "$l => $r | $n"
    incr part1 $n
}
puts $part1