DecimalConverter

#include <iostream>
#define ULL unsigned long long int
using namespace std;

int main()
{
    char c,s[100];
    cin>>c;
    ULL n;
    cin>>n;
    int b;
    if(c=='b')
        b=2;
    if(c=='o')
        b=8;
    if(c=='h')
        b=16;
    int L=0;
    while(n)
    {
        switch(n%b)
        {
            case 0: s[L++]='0';break;
            case 1: s[L++]='1';break;
            case 2: s[L++]='2';break;
            case 3: s[L++]='3';break;
            case 4: s[L++]='4';break;
            case 5: s[L++]='5';break;
            case 6: s[L++]='6';break;
            case 7: s[L++]='7';break;
            case 8: s[L++]='8';break;
            case 9: s[L++]='9';break;
            case 10: s[L++]='A';break;
            case 11: s[L++]='B';break;
            case 12: s[L++]='C';break;
            case 13: s[L++]='D';break;
            case 14: s[L++]='E';break;
            case 15: s[L++]='F';break;
        }
        n/=b;
    }
    for(int i=L-1;i>=0;--i)
        cout<<s[i];
}