#include<cstdio>#include<cstring>using namespace std;char s[8]="IVXLCDM";int b[7]={1,5,10,50,100,500,1000};int ToDec(char *str){ int n,k,i,j,c[33]; n=(int)strlen(str); for(i=0;i<n;i++) for(j=0;j<7;j++) if(str[i]==s[j]) { c[i]=b[j]; break; } c[n]=0; for(i=k=0;i<n;i++) if(c[i+1]>c[i]) k-=c[i]; else k+=c[i]; return k;}void ToRoman(int k,char *str){ int i,j,m; for(i=6,j=0;i>=0;i--) { while(k>=b[i]) str[j++]=s[i],k-=b[i]; if(!k) break; if(i&1) m=i-1; else m=i-2; if(k>=b[i]-b[m]) { k-=b[i]-b[m]; str[j++]=s[m]; str[j++]=s[i]; } } str[j]=' ';}int main(){ char str[33]; int k,i,j,stk[1111]; for(i=j=0;scanf("%s",str)+1;) { if(str[0]=='=') { if(!i) { puts("stack underflow"); continue; } if(stk[i-1]<=0||stk[i-1]>4999) puts("out of range exception"); else ToRoman(stk[i-1],str),puts(str); } else if(str[0]=='+'||str[0]=='-'||str[0]=='*'||str[0]=='/') { if(i<2) { puts("stack underflow"); continue; } if(str[0]=='+') stk[i-2]=stk[i-1]+stk[i-2]; else if(str[0]=='-') stk[i-2]=stk[i-2]-stk[i-1]; else if(str[0]=='*') stk[i-2]=stk[i-1]*stk[i-2]; else { if(!stk[i-1]) puts("division by zero exception"); else stk[i-2]=stk[i-2]/stk[i-1]; } i--; } else stk[i++]=ToDec(str); } return 0;}
