#include #include using namespace std; int main(int argc, char* argv[]) { int n; cin>>n; int m=20; char ch='a'; int i,j; char ch1=ch; string S; for (i=0;i'z'){ ch='a'; } if (ch+index=='n'){ index++; } S.push_back(char(ch+index)); ch1=ch+index; } if (i==n-1){ S[S.length()-1]='n'; } cout<