s=0
gets.chars.each_cons(2).map{|a|i,j=a.map{|e|'123456789.0'.index e}
i&&j&&s+=((i%3-j%3)**2+(i/3-j/3)**2)**0.5}
print s.round(2),'cm'
cz0wCmdldHMuY2hhcnMuZWFjaF9jb25zKDIpLm1hcHt8YXxpLGo9YS5tYXB7fGV8JzEyMzQ1Njc4OS4wJy5pbmRleCBlfQppJiZqJiZzKz0oKGklMy1qJTMpKioyKyhpLzMtai8zKSoqMikqKjAuNX0KcHJpbnQgcy5yb3VuZCgyKSwnY20n