#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; scanf("%1d%1d%1d%1d",&a,&b,&c,&d); cout<<a*100+b*1000+c*1+d*10; return 0; }