# include # include # include char stack[50]; int top=-1; int push(char elem) { if(top<50) { top++; stack[top]=elem; return(1);} else {return 0;} } char pop() { if(top==-1) { return(0);} else{ return(stack[top--]); } } int main() {int N;char arr[50]; int count=0; int n; scanf("%i",&N); int k; for(k=0;k