#include<iostream> // cin\cout\endl #include<cstdio> //scanf()\printf() #include<cstring> // strcpy()\strcat()\strcmp()\strlen()\memset() #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() using namespace std; int main(){ char s1[101],s2[101]; cin>>s1>>s2; int n=strlen(s); cout<<n<<endl; strcat(s,s2); cout<<s<<endl; return 0; }