#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(){ int a,b,c,d,e; cin>>a; d=a%10; e=a%100-d; b=a%1000-e-d; c=a%10000-e-d-b; cout<<c/10+b*10+e/10+d*10; return 0; }