let N = +readline();
const subseq = [];

while (N--) {
    subseq.push(readline());
}
function getAllSubstrings(str) {
  var i, j, result = [];

  for (i = 0; i < str.length; i++) {
      for (j = i + 1; j < str.length + 1; j++) {
          result.push(str.slice(i, j));
      }
  }
  return result;
}
let arr=[]
for(let i =0;i<subseq.length;i++){
arr.push(getAllSubstrings(subseq[i]))}
// Write an action using console.log()
// To debug: console.error('Debug messages...');

function intersect(a, b) {
      var setB = new Set(b);
      return [...new Set(a)].filter(x => setB.has(x));
}
if(subseq.length===2){
arr2 = intersect(arr[0],arr[1])
print(subseq[1].length-arr2.length+subseq[0].length)}