#/***********************************************************
#    isbn.rb -- ISBN番号
#***********************************************************/

d = []

printf("ISBN book number: ")
for i in 1..10
    c = $stdin.getc
    if (c >= ?0 && c <= ?9)
        d[i] = c - ?0
    elsif (i == 10 && (c == ?x || c == ?X))
        d[i] = 10
    else
        exit 1
    end
end
d[0] = 0
for i in 1..10; d[i] += d[i - 1]; end
for i in 1..10; d[i] += d[i - 1]; end
if (d[10] % 11 == 0)
    puts("Valid");  # 有効な番号 
else
    puts("Wrong");  # 無効な番号 
end

exit 0