#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; b=a%10; c=a/10%10; d=a/100%10; e=a/1000; cout<<e*100+d*1000+c+b*10; return 0; }