#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; cin>>a; int g=a%10,s=a/10%10,b=a/100%10,q=a/1000; cout<<g*10+s+q*100+b*1000; return 0; }