S001-AC.cc
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#include <iostream>
#include <string>
#include <cmath>
using namespace std;
int toDecimal(string str)
{
int n = 0;
int i = 0;
char n1, n5, n10;
while(str[i] == 'M')
{
n += 1000;
i++;
}
if(str[i] == 'C' && str[i+1] == 'M')
{
n += 900;
i += 2;
}
if(str[i] == 'D')
{
n += 500;
i++;
}
if(str[i] == 'C' && str[i+1] == 'D')
{
n += 400;
i += 2;
}
while(str[i] == 'C')
{
n += 100;
i++;
}
if(str[i] == 'X' && str[i+1] == 'C')
{
n += 90;
i += 2;
}
if(str[i] == 'L')
{
n += 50;
i++;
}
if(str[i] == 'X' && str[i+1] == 'L')
{
n += 40;
i += 2;
}
while(str[i] == 'X')
{
n += 10;
i++;
}
if(str[i] == 'I' && str[i+1] == 'X')
{
n += 9;
i += 2;
}
if(str[i] == 'V')
{
n += 5;
i++;
}
if(str[i] == 'I' && str[i+1] == 'V')
{
n += 4;
i += 2;
}
while(str[i] == 'I')
{
n += 1;
i++;
}
return n;
}
int main()
{
string str;
while(cin >> str)
{
str.erase(str.size()-1,1);
cout << str << " = " << toDecimal(str) << endl;
}
return 0;
}