#!/usr/bin/env node


var inputstring = require('fs').readFileSync('input.txt','utf8');

var lines = inputstring.split('\n').filter(i=>i);
var minNumerical = '0'.charCodeAt(0);
var maxNumerical = '9'.charCodeAt(0);

function onlynumerical(str) {
 return str.split('').map(i=>i.charCodeAt(0)).filter(i=>(i>=minNumerical && i<=maxNumerical)).map(i=>i-48);
}
function firstandlast(arr) {
 return [arr[0],arr[arr.length-1]];
}
var nums = lines.map(i=>{
 var nums = firstandlast(onlynumerical(i));
 //console.log({nums});
 return nums[0]*10+nums[1];
});
//console.log({nums});

var sum=0;
for(var i of nums) {
 sum+=i;
}
console.log(sum);