#include #include #include #include #include #include #include #include #include #include #include #include #include #include using namespace std; #define rep(i,n) for(int i=0;i=0;i--) #define DREP(i,n) for(int i=n;i>0;i--) #define Rep(i,m,n) for(int i=m;i vi; typedef vector > vvi; typedef pair pdd; typedef pair pii; const double pi=acos(-1.0); double rad(double t){return t*pi/180.0;} double deg(double d){return d*180.0/pi;} int GCD(int x,int y){if(x> n; string S,T; cin >> S >> T ; int ans=0; rep(i,n){ if(S[i]!=T[i])ans++; } printi(ans);LF; return 0; }