#include <stdio.h>
#include <string.h>
 
void toABC(int n, char *s){
	s[0] = '\0';
	int i=0;
	int k;
	char c;
	while(n>0){
		s[i] = 'A'-1 + n%27;
		n /= 27;
		++i;
	}
	s[i] = '\0';
	for(k=0;k<i/2;++k){
		c = s[k]; s[k] = s[i-1-k]; s[i-1-k]=c;
	}
}
long long LaySo(char *str, char b, char e){
	long long n = 0;
	int i=0;
	while(str[i]!=b) ++i; //dich den chu
	++i; //bo qua chu
	while(str[i]!=e){
		n += (str[i]-'0') + n*10;
		++i;
	}
	return n;
}
int main(void) {
	// your code here
	char s[100];
	char c[10];
	long long hang;
	int cot;
	while(1){
		scanf("%s",s);
		if(strcmp(s,"R0C0")==0) break;
		hang = LaySo(s,'R','C');
		cot  = (int)LaySo(s,'C','\0'); //0 = '\0'
		toABC(cot,c);
		printf("%s%lld\n",c,hang);
	}
	return 0;
}

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R1C1
R3C1
R1C3
R299999999C26
R52C52
R53C17576
R53C17602
R0C0