#include #include #include #include #include #include #include #include #include #include #include #include #include #include #define loop(i,a,b) for(int i=a;i pii; typedef vector vi; typedef vector vvi; typedef vector vp; typedef vector vvp; typedef vector vs; typedef vector vd; typedef vector vvd; typedef pair pip; typedef vectorvip; const double PI=acos(-1); const double EPS=1e-7; const int inf=1e8; const ll INF=1<<60; int dx[4]={0,1,0,-1}; int dy[4]={1,0,-1,0}; int main(){ string s; cin>>s; rep(i,s.size())if(isupper(s[i]))s[i]=tolower(s[i]); else s[i]=toupper(s[i]); cout<